全球变化知识资源中心

The demand for new electrical and electronic equipment (EEE) has resulted in short replacement cycles for this equipment. This has led to the generation of a large amount of waste electrical and electronic equipment (WEEE). The proper disposal of WEEE is essential in order to manage greenhouse gas (GHG) emissions, as refrigerant injected EEE is a potential source of GHG emissions. In this study, carbon dioxide (CO2) emissions from recycling activities that resulted in GHG emissions via refrigerant recovery were quantitatively evaluated. The evaluation was conducted based on the operational data from a WEEE recycling plant in 2016. To estimate CO2 emission and offsetting effects, mass-balance and carbon-footprint analyses were conducted. The mass balance data showed that 22,804 t of WEEE were recycled in a plant. The carbon-footprint analysis estimated that CO2 emissions from all recycling activities, including all machinery and vehicles as well as fossil fuel and electricity use, reached approximately 4.097 x 10(3) tonne of CO2 eq. Meanwhile, the CO2 emissions prevented by the manual recovery of refrigerants (5186 kg) from WEEE accounted for approximately 2.877 x 10(4) tonne of CO2 eq. These results, based on data from a recycling plant and showing an offset of CO2 emissions by a factor of 7.02, demonstrate that refrigerant recovery could potentially reduce emissions by 2.467 x 10(4) tonne of CO2 eq. per year. This study will demonstrate the optimal methodologies for estimating CO2 emissions and offsetting, and inform environmental policy by providing an alternative approach to the problem of global warming.